Why it matters
Margin is important because it determines:- whether you can open a position
- how much market movement your trade can handle
- how close you are to liquidation
Simple example
Imagine you want to open a500 USDC position.
If you use 100 USDC as margin, that 100 USDC is the collateral behind the trade.
- If the trade goes in your favor, profit is earned on the full
500 USDCposition - If the trade goes against you, losses also come from that full position
Initial margin and maintenance margin
You may see two related ideas:- Initial margin: the amount needed to open the trade
- Maintenance margin: the minimum amount needed to keep it open
not enough remaining margin = position is at risk
Why beginners should care
Many beginners think margin is just a technical setting. It is not. Margin is directly connected to risk. If you use too little margin, even a normal market move can put your trade in danger. If you use enough margin, the same trade has more room to breathe.Practical example
You open a BTC perpetual position with:- position size:
1,000 USDC - margin:
200 USDC
200 USDC margin. The smaller that cushion becomes, the closer the position gets to liquidation.
If you want to understand how the terminal arrives at the liquidation boundary and why that number can move while the trade is open, continue to Liquidation price and risk engine.
Why margin can appear again after you used your full balance
Sometimes you open a trade, use all available margin, and later notice that part of the balance becomes available again. This usually happens for one of these reasons:- the position moved into profit, so unrealized PnL increased your available collateral
- one or more open orders were filled, reduced, or canceled, which released reserved funds
- the position size became smaller after a partial close, so less margin was needed to support it
- under cross margin, your account balance is shared across positions, so changes in PnL and open exposure can change what is available
What you can do with newly available margin
If margin becomes available again, you can usually use it in the same ways as any other free collateral in the account:- open another position
- add size to an existing trade
- place new orders
- transfer or withdraw it, if it is not needed for open positions and active orders
- realized balance is stable
- unrealized PnL can temporarily increase available margin
- funds locked in positions or active orders are not fully free to use elsewhere